Just the opposite has happened to me. My kid was on a club soccer team and 3/4 of the players parents were from Mexico and Central America. At one practice, 5 of the Dads were talking along the sideline, and as I approached the group, they all switched from Spanish to English before they even acknowledged me.
Btw, I don't know where you're at but I can assure you, that isn't the norm in the southwest. So much so there has been a million complaints to stop this in the work place due to all the complaints from English only speakers.
It's totally disrespectful to the folks who have to endure this in a workplace environment day in and day out.
I highly suspect youre fabricating every word of that little story.
Btw, Houston like LA is turning into just another 3rd world dumping ground. Its no secret.
I just read 1 in 4 in Houston are now foreign born. I was published today.
http://www.teaparty.org/1-4-houston-born-foreign-country-116887/